| Air pollution has become a huge environmental issue due to the large amount of air pollutants emitted by human activities such as industry,transport,waste incineration and power generation.Air pollution affects the climate,visibility and even human health.The incidence of many diseases is closely related to air pollution.Suspended particulate matter of different sizes represents a major source of environmental pollution,particularly in many developing countries.Fine particles,especially ultrafine particles smaller than 2.5 ?m,might be more harmful to human health because of their extremely small size,which enables them to penetrate human lungs and bronchi and makes them difficult to filter out.At the same time ultrafine particles with large specific surface area will absorb more moisture and toxic gas pollutants and the small particles have longer residence time in the atmosphere.Therefore,the fatal risks associated with PM call for the development of air purification materials with high efficiency and low resistance.In this study,poly(lactic-co-glycolic acid)and polycaprolactone were used to prepare nanofibrous membranes suitable for the efficient capture of particulate matter formed in haze-fog episodes,especially particles smaller than 0.5 ?m.The present nanofirous membranes exhibit superior filtration efficiency for particulate matter,they showed excellent filtration especially for ultrafine particles.It is worth mentioning that the pressure drop of the nanofirous membranes are negligible.Thanks to the combination of small pore size,high porosity,and robust mechanical properties,the poly(lactic-co-glycolic acid)/polycaprolactone(6:4)composite membrane exhibits a high filtration efficiency of 97.81% and a low pressure drop of 181 Pa.These favorable features,combined with the easy availability and biocompatibility of the component materials,highlight the promising potential of the present nanofibrous membranes for the development of personal wearable air purifiers. |
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